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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: zImage not supported for 2.2.20?
Date: 1 Jan 2002 16:54:52 -0800
Organization: Transmeta Corporation, Santa Clara CA
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In-Reply-To: <4.3.2.7.2.20011228173505.00aa3da0@192.168.124.1> <4.3.2.7.2.20011228124704.00abba70@192.168.124.1> <4.3.2.7.2.20011228173505.00aa3da0@192.168.124.1> <4.3.2.7.2.20011231090710.00ab7e30@192.168.124.1>
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Copyright: Copyright 2002 H. Peter Anvin - All Rights Reserved
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Followup to:  <4.3.2.7.2.20011231090710.00ab7e30@192.168.124.1>
By author:    Roy Hills <linux-kernel-l@nta-monitor.com>
In newsgroup: linux.dev.kernel
> 
> My understanding is that the problem is something to do with the
> Toshiba Tecra laptops not flushing the cache properly when activating
> the A20 line.  This causes a problem for bzImage kernels because they
> decompress into extended memory, whereas zImage kernels don't and
> thus don't tickle the bug.
> 

It's a timing problem; it has nothing to do with the cache.  The
workaround for the timing problem was added a long time ago.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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